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authorTejun Heo <tj@kernel.org>2013-04-01 19:08:06 -0700
committerTejun Heo <tj@kernel.org>2013-04-01 19:08:06 -0700
commitb5c872ddb7083c7909fb76a170c3807e04564bb3 (patch)
tree6daa0f960c87f799ca35a9d87e5c24fccc07ecab
parent839a8e8660b6777e7fe4e80af1a048aebe2b5977 (diff)
downloadop-kernel-dev-b5c872ddb7083c7909fb76a170c3807e04564bb3.zip
op-kernel-dev-b5c872ddb7083c7909fb76a170c3807e04564bb3.tar.gz
writeback: expose the bdi_wq workqueue
There are cases where userland wants to tweak the priority and affinity of writeback flushers. Expose bdi_wq to userland by setting WQ_SYSFS. It appears under /sys/bus/workqueue/devices/writeback/ and allows adjusting maximum concurrency level, cpumask and nice level. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--mm/backing-dev.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 2857d4f..5025174 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -259,7 +259,7 @@ static int __init default_bdi_init(void)
int err;
bdi_wq = alloc_workqueue("writeback", WQ_MEM_RECLAIM | WQ_FREEZABLE |
- WQ_UNBOUND, 0);
+ WQ_UNBOUND | WQ_SYSFS, 0);
if (!bdi_wq)
return -ENOMEM;
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